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@demystify/embed-core

v0.1.1

Published

Iframe host for Demystify embedded surfaces: origin-validated postMessage, auto-resize, a11y, theming.

Downloads

803

Vulnerabilities

Powered byPowered by Snyk
  • 0High
  • 0Medium
  • 0Low

Links

Git

Maintainers

demystifier09demystifier09

Keywords

Readme

@demystify/embed-core

The host side of a Demystify embedded surface. You normally install @demystify/sign-embed or @demystify/pay-embed instead — this arrives as their dependency.

Guide: docs/48-UI-INTEGRATION.md.

Why it exists

Receiving a postMessage safely takes four checks, and skipping any one of them is a real vulnerability that no test in your app will catch:

  1. Origin, by string equality. startsWith accepts https://sign.demystifysystem.com.attacker.test.
  2. Sender identity. event.source === iframe.contentWindow. Origin alone does not identify which frame sent a message.
  3. Shape. Parsed against the contract; anything else is ignored rather than guessed at.
  4. Session. A stale iframe from a previous mount must not drive the current UI.

mountEmbed does all four. It also auto-sizes the frame (an iframe cannot size itself), respects prefers-reduced-motion, and requires a title so screen-reader users do not land on an unlabelled frame.

The rule that matters more than any of this

These events are for UX only. A postMessage comes from a browser the end-user controls. Move your UI on them; never mark an invoice paid or a contract executed. That belongs to the webhook — signed, retried, idempotent.